It is very interesting that most member in Audioasylum believe the cables must in equal length for both channel, but I do not know if they can tell the differences when the cables are in unequal length.
Not surprised at that. It is a good rule of thumb especially if one side is very much longer. I would not use unequal lengths but then again I would not spend so much on cables so it does not matter to me as the cost to get equal lengths is a negligible issue.
My suggestion would be to buy some less expensive highly respected Mogami XLR from a music shop or something with Canare wire or whatever floats you boat. Spend only $100 bucks or less and get equal lengths.
The draw back is that that these XLR cables are not called "Valhalla" and few audiophiles will go "ooo", "ahh" and "wow" when they peruse your virtual system one day to ask you about cable synergy. You might even get the opposite...questions like how in your right mind can you connect those great speakers with ordinary wires...no gold no silver ? If these comments make you feel insecure then by all means spend the extra money (like the ladies who only wear Prada) but then as the man from ING says in the adds you could also be smart and "Save your Money".